The problem you have is that CP936 is a Chinese Language Code Page, and Chinese does not map to UTF-8, it actually maps better to UTF-16, this is because Chinese characters are double-byte rather than single-byte characters.
Did you try without the -e utf-8 parameter? Without the use of this parameter the migratetoc8 program uses the code page of the PC it is running on, so if your code page is actually CP936 then it should be able to migrate the reports correctly.

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